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新编的高中化学课本已在本年八月间开始供应,为了帮助教师同志研究新教材和联系旧教材,我把我们在编辑当中所遇到的几个问题的解决方法和解决这些问题的有关实验等介绍出来以供参考。这篇所提供的材料在教学上不一定完全适用,有不妥当的地方,希望大家指正。 1.定组成定律的证明在一般化学实验书籍中,介绍证明定组成定律的实验很少。我们证明时是采用了铜粉和氧气的化合反应。把极细的铜粉放在坩埚里,用酒精喷灯加强热,就生成黑色氧化铜。实验的秤量结果(几次实验中的一项记录)如下:
A new high school chemistry textbook was launched in August this year. In order to help teachers and teachers to study new textbooks and to contact old textbooks, I put forward some solutions and solutions to some of the problems we encountered in editing Experiments, etc. introduced for reference. The materials provided in this article may not be completely applicable to teaching. There are inappropriate places and I hope Members can correct me. 1. Proof of the law of composition In the general chemistry experiment books, there are few experiments on the proof of the law of composition. We prove that we used a combination of copper powder and oxygen. The very fine copper powder in the crucible, with alcohol burner enhance heat, it generates black copper oxide. The results of the experiment (one of several experiments) are as follows: